diff options
| author | Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> | 2011-11-14 13:23:34 +0400 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-12-27 13:17:19 +0400 |
| commit | 7850ac5420803996e2960d15b924021f28e0dffc (patch) | |
| tree | dc4ed43a8e5ffcfbf45b48c8d78228ffe9762efa /arch/x86/kvm | |
| parent | 9b9b1492364758de82c19c36f07baa9ae162c7e5 (diff) | |
| download | linux-7850ac5420803996e2960d15b924021f28e0dffc.tar.xz | |
KVM: Count the number of dirty pages for dirty logging
Needed for the next patch which uses this number to decide how to write
protect a slot.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index a3b25a524c9b..220c83b0fbda 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3466,10 +3466,9 @@ static int kvm_vm_ioctl_reinject(struct kvm *kvm, int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log) { - int r, i; + int r; struct kvm_memory_slot *memslot; unsigned long n; - unsigned long is_dirty = 0; mutex_lock(&kvm->slots_lock); @@ -3484,11 +3483,8 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, n = kvm_dirty_bitmap_bytes(memslot); - for (i = 0; !is_dirty && i < n/sizeof(long); i++) - is_dirty = memslot->dirty_bitmap[i]; - /* If nothing is dirty, don't bother messing with page tables. */ - if (is_dirty) { + if (memslot->nr_dirty_pages) { struct kvm_memslots *slots, *old_slots; unsigned long *dirty_bitmap; @@ -3503,6 +3499,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, goto out; memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots)); slots->memslots[log->slot].dirty_bitmap = dirty_bitmap; + slots->memslots[log->slot].nr_dirty_pages = 0; slots->generation++; old_slots = kvm->memslots; |